Rainbow Chalk Markers Limited Grout Paint Marker White 3-Pack — 5mm Narrow Tip, 7mL Water-Based for Unsealed Grout

The Rainbow Chalk Grout Pen is a narrow 5mm white grout paint marker (7mL) sold in a 3-pack to quickly recolor and refresh unsealed tile grout without scrubbing.

This pen set is designed for fast grout touch-ups and small DIY refreshes around the home. The water-based, non-toxic formula covers worn or stained grout lines, restoring a cleaner, brighter appearance on walls, backsplashes, showers, tubs and floors. Each marker has a cotton 5mm tip for precise application, and the 7mL ink supply covers up to about 150 feet of narrow 2mm grout lines — making the three pens suitable for multiple rooms or a few larger projects.

How do I get the pen ready for use?

New Rainbow Chalk Grout Pens arrive with a dry white tip and must be primed before application. Instead of shaking, rapidly pump the tip onto a scrap surface 30 or more times until ink saturates the cotton; shaking with the cap off can dislodge the tip. If activation feels slow, replace the cap, wait a minute, then continue pumping.

• Prime by repeatedly pressing the tip down 30+ times until ink flows.
• Do not shake pen without the cap — tip may fall out.
• Test on an inconspicuous area to confirm color and flow.

Which surfaces and grout conditions work best with this grout pen?

Use these pens only on unsealed, absorbent grout; sealed grout won’t bond well. The manufacturer recommends a simple water test: apply a few drops of water — if it soaks in within a minute, the grout is likely unsealed and ready. Avoid applying over silicone or flexible sealants and always test a hidden spot first.

• Ideal for unsealed grout in bathrooms, kitchens, backsplashes, showers and floors.
• Not effective on sealed or non-porous grout — perform a water absorption test.
• Avoid use over caulk, silicone or moving joints.

How long will the color last and how durable is the finish?

The formula is a water-based colorant meant to cover stains and restore appearance, not to act as a structural grout repair. With normal use and after proper drying, the recolored grout resists light surface wear, but heavy scrubbing or abrasive cleaners will reduce longevity. For high-traffic floors or wet, frequently scrubbed areas, periodic touch-ups may be needed.

• Covers approximately 150 feet of 2mm grout per pen for thin grout lines.
• Best for cosmetic recoloring; heavy wear areas may require maintenance.
• Allow full drying before exposing to water or cleaners for best durability.

What application tips help get crisp, even lines?

Work in short, steady strokes following the grout joint, resting the pen lightly to avoid fraying the cotton tip. If the tip wears, pressing too hard will damage it; contact the seller for replacement tip options. Use painter’s tape along tile edges for ultra-clean lines and wipe excess promptly with a damp cloth while wet.

• Use light pressure and smooth, continuous strokes for even coverage.
• Protect tile edges with tape for sharper results and easier cleanup.
• If the tip degrades, request a replacement rather than pressing harder.

Who is this for? Homeowners, renters, DIYers and small contractors who want a quick visual refresh for stained or dingy grout without regrouting will find these pens useful. They suit anyone needing precise control in tight joints — especially in bathrooms and kitchens — and who understands this is a cosmetic recolor for unsealed grout, not a structural repair or permanent sealant replacement.